The second movement Adagio of Mozart's Sonata in B-flat, K.570 is poised and noble. The sonata was composed in Vienna in 1789. It is a lovely work with a spacious and sometimes contrapuntal design. David Dubal calls it "a model of sonata design." A piano and violin version of this sonata exists. It is believed that the violin part was added by the publisher André or Artaria.